Molding device



' V. E. SCHMIEDEKNECHT MOLDING DEVICE Filed Feb. 26. 1926 3 Sheets-Sheet 1 11m. lHT'W Wtn 5 @TTORNEY March 13, 1928. H

V. E. SCHMIEDEKNECHT MOLDING DEVICE Filed Feb. 26. 1926 3 Sheets-Sheet 2 INVENTOR 1461 7 21 Qcfimkdehwc/zt ATTORNEY March 13, 1928.

1,662,340 v. E. SCHMIEDEKNECHT MOLDING DEVICE Filed Feb. 26. 1926 5 Sheets-meet 3 e e J 4 HZ 1 e e 55 H 66 I INVENTOR wczarzzeiimkdawmz vBY ' v ATTORNEY Patented Mar. 13, 1928.

UNITED STATES PATENT oFFlcE.

VICTOR E. SCHMIEDEKNECHT, OF LOUISVILLE, KENTUCKY, ASSIGNOR OF ONE-HALF TO GOHMANN BROTHERS AND KAHLER COM?ANY, OF NEW ALBANY, INDIANA, A.

CORPORATION.

MOLDING DEVICE.

Application filed February 26, 1926. Serial No. 90,873.

This invention relates to molding devices and processes such as are used in the torm ing of sand molds for casting articles in iron, brass and other metals.

More particularly the invention relates to molding devices of the type known as sandslingers wherein the molding sand is formed into wads or slugs and forcibly thrown into the flask containing the pattern, and to the process of molding patterns with such machines. As a type of the machine referred to may be mentioned the sandslingers manufactured by the Beardsley and Piper Company of Chicago, Illinois. g

In such machines the sand is delivered from the machine head in comparatively large slugs or wads and experience has shown that sand thus thrown into the flask does not always properly till the space around the pattern, this being due to the slugs retaining more or less of their original size and shape so that interstices are left at the surface of the pattern between it and the mass of sand with the result that rough and uneven castings are produced when it is soughtto cast in such molds.

Again, in the productive use of present sand projecting devices, applied to the ramming of sand molds in the process of making metal castings, there exist certain practical defects with regard to themanner in which the sand is projected into the mold, and principally with regard to the lack of means for varying or controlling the 1nten s'ity with which the sand is bedded upon the pattern and within the bounds of the flasks.

It is a well known fact among those skilled in the art of molding processes that the best results in making molds areobtained by first carefully sifting and bedding sand adjacent to the pattern, and then tuckmg, pressing or ramming the succeeding courses of the mold. In otherwords, it is not desirable to bring hard ramming to bear directly upon a pattern surface, as undesirable creases, raised lines, ridges, etc., will result, as an evidence to lack of uniformity of the mold formation.

Up to the present time the prevailing defeet of sand projectingor throwing devices for ramming sand molds is that there is no means of controlling or varying the intensity of the rammed sand with regard to its relations to the pattern, resulting in serious surface conditions which give rise to undesirable finishes of the castings poured therein. i

The wads of sand thrown by the machines at present are uncontrollable and invariable, and there is no ready means to even approximate the methods of a skilled molder, who carefully beds his pattern to get the desired surfaces as described above.

One important object of the present invention is to provide novel meansi'or controlling the intensity of the ramming action of sand throwing machines in such manner as to accomplish in mechanical way what the experienced molder would do by hand.

A second in'iportantobject of the invention is to provide an improved process of rannningmolds by throwing wads of sand into a flask having a pattern therein.

With the above and other objects in view as will be hereinafter fully apparent, the invention consists in general of certain novel details of construction and combinations of fically claime In the accompanying drawings like characters of reference indicate like parts in the several views, and:

Figure l is a perspective view of part of a sand throwing machine or sand ,slinger having one form of the invention applied plane of that Figure.

Figure .5 is a plan view of a bar supporting frame used with the second form.

Figure v(fis a side view of the frame shown in Figure 5.

Figure 7 is a plan viewof said frame partly removed from its housing.

parts hereinafter fully described, illustrated in the accompanying drawings and speci- Figure 8 is a side view of Figure 7 part ly in section.

Figure 9 is a view of a flask having a third term of the invention applied thereto.

liigure it) is a View similar to Figure 9 showing a l'ourth Form of the invention.

Figure ll a plan view of a fifth modification of the. invention.

Figure 12 is a section on the line12--12ot Figure 11.

Figure 13 is an end view of a moditied form ol' s 'ilitting or disintegrating bar used herewith.

Figure 14. an end view of a further n'niditication ol the bar.

The invention may be briefly described as the process at breaking into smaller parts a certain percent; at wads ot sand ejected from a sand throwing machine or sand stinger in their paths to a molding flask and in the provision ol suitable meclumical means to accomplish this,

In order to illustrate how this may be accomplished I have illuvtrated in Figure 1 part of the head 10 and the feeder belt 11 of a sandslii'iger the construction of which is well known and needs no further description that is to say that by this mechanism a series o'l' wads ol' compacted sand are thrown through the delivery nozzle ii.

In thi. form there in lined to the head a downwardly extending post 13 whereOn is revolubly mounted a boss, it which is formed at one corner or" a rectangular frame 15 llfiVlTtff in the upper edges 0t opposite side wall= the notches t6 and in the remainim, side walh lots l? intermediate the top and bottom edges of said trame.

In these notches and slots are held the disintegrating; ha a or knives 18 and extending from the bo a handle 19 by which the frame and i as may be swung beneath the nozzle '12 as in tall lines or out of alinement with said nozzle as in dotted lines. It is to be noted that the sides are provided with a number oi notches and slots and that these may be spaced as closely as desired so that a greater r less number of bars or knives may be used as may be desired. W'ith thee-e bars in position a reticulated structure is 'tormed. the size of the reticulation depending on the number of bars used. The usual tlask Q0 and pattern 21 are provided beneath the. deliveev nozzle of the head.

The peration of this form of the device is like that of all the other "forms and will he now described, it being understood that it applies equally to such other terms. As the wads are forcibly thrown down towards the flask trom the head 10 they will pass through the reticulated structure just described. According to the size. of the reticulations all or part of the wads will strike thev knives or bars and be split into two or more parts, a certain amount of loose sand being also produced by this action. The wads are thus partly disintegrated and in this partially disintegrated condition are forcibly thrown into the tlask. Since the size of the reticnlations can be varied this partial disintegration can be varied in extent. Alro by using a tiat. edged kni't'e, a round edged knit'e or a sharp edged knil'e the amount of loose sand produced can be regulated and the character of the partial disintegration controlled. Thus the sand can be rammed around the pattern in larger or smaller wads and with or without loose sand so that ell'ects equal to the best band molding are produced.

in the form shown in Figures 2 to 8 inclusive there is provided a tubular housing 22 which has a channeled upper end arranged to embrace the [tango ol' the nozzle t2 and to be secured thereto by the set; screw 2 as best seen in Figure 2. At the. lower end of this housing there is tormed a quadrantal casing :14 having parallel upper and lower walls. the lower wall being provided with a delivery opening Between thew upper and lowcr walls at the center of the quadrant extends a pivot bolt Qti and within the casing is arranged a square knife or bar carrying frame. having at one corner a boss 27 mounted revolubly on the bolt it; and ]'irovidcd with a handle by means. of which the frame may he swung into and out oi rcg'tstry with the opcninc 25. in thia' form the. frame consists of an outer frame member 29 carrying the boss and havin; s ides which are Lshaped in cross section. \Vithin this outer frame is removably started an inner l'rame 3t) which has rectangular sides provided with notches 31. one pair at opposite sides having there notches in the top cdgw while the remaining pair has sine ilar notches in the bottom edges. in these notches are held the usual bars or knives 18 thus forming the reticulated structure common to all forms of the invention. (in top ol the frame 29 is mounted a. cover rim 3%" having downwardly extending lugs 33 which engage the outside ol the frame 29 and prevent slippinc ot' the rim with respect to the frame Qt), the whole arrangement; being such as to tit snugly between the top and bot tom of the casing 24 so that the rim cannot be accidently displaced. lVhcnevcr it is de' tired to change the size of the. reticulation-i the entire frame is swung: clear of the casing, the rim and inner frame removed and another inner l'rame. havin; ditl'crcnily spaced bars or knives inserted. After thir the rim is replaced and the frame may he swung back into the housing.

In the form of the invention shown in Figure 9 the wad disintegrating means consists of a simple sheet of expanded metal Ttl ill)

loo

ill)

or wire mesh 34 of suitable size laid directly on the flask 20.

Similarly the form shown in Figure 10 consists merely of two sets of bars or knives 18, one set being laid directly on the edges of the flask while the other set is laid crossways on the upper edges of the first set.

In the form shown in Figures 11 and 12 a double frame consisting of upper and lower halves 35 has its parts held together by screws 36 and these halves clamp the edges of a suitable wire or expanded metal mesh 37 In this form the frame may be made to fit in the outer frame 29 previously described or may rest on the flask directly.

Thus in each form there is interposed be tween the flask and wad throwing device means for partially or wholly disintegrating part or all of the wads thrown from such device toward a flask.

There has thus been provided a simple and eflicient device of the kind described and for the purpose specified.

It is obvious that minor changes may be made in the form and construct-ion of the invention without departing from the material spiritthereof. It is not, therefore, desired to confine the invention to the exact form herein shown and described, but it is desired to include all such as properly come within the scope claimed.

Having thus described the invention, what is claimed as new, is:

1. The combination with a sand wad throwing device and a moldin flask receiving wads therefrom; of a. wad disintegrating device pivotally mounted between the throwing device and flask and movable intoand out of the paths of the wads passing from the throwing device to said flask.

2. The combination with a sand wad throwing device and a. moldingflask receiving wads therefrom; of a recticulated structure pivotally mounted between the throwing device and flask and movable into and out of the paths of the wads passing from the throwing device to said flask.

3. The combination with a sand Wad throwing device and a molding flask receiving wads therefrom; of a frame supporting a reticulated structure and .pivotally mounted between the throwing device and flask and movable into and out of the paths of the wads passing from the throwing device to said flask.

4:. The combination with the throwing head of a sand throwing machine and its delivery nozzle; of a frame pivoted to said head at one side of the nozzle and arranged to swing into and out of registry with the nozzle, and a reticulated structure supported by said frame.

5. The combination with the throwin head of a sand wad throwing machine an its delivery nozzle; of a pivot post supported from said head at one side of the nozzle, a rectangular frame having a boss at one corner rotatably mounted on said pivot post whereby said frame may be swung into and out of registry with said nozzle, and a. reticulated structure supported in said frame.

6. The combination with the throwing head of a sand wad throwing machine and its delivery nozzle; of a pivot post supported from said head at one side of the nozzle, a retangular frame having a boss at one corner rotatabl mounted on said pivot post whereby sari frame may be swung into and out of registry with said nozzle, 2. second frame removably mounted in the fiirstframe, and elei'nents crossing the space in the sec- "ond frame to form reticulations.

7. The combination with the throwing head of a sand wad throwing machine and its delivery nozzle; of a pivot post supported from said head at one side of the nozzle, a

rectangular frame having a boss at one corner rotatably mounted on said pivot post whereby said frame may be swung into and out of registry with said nozzle, a second frame removably mounted in the first frame, elements crossing the space in the second frame to form reticulations, av cover rim seated on the first frame to hold the second frame in position, and a quadrantal casing below the delivery nozzle and into and out of which the frames may swing,

8. In combination with a sandslinging machine, a baiile comprising a webwith a series of spaced apart openings therethro'ugh, means for moving said baflle relative to the sand discharge outlet of said sandslinging machine whereby when said battle is in closed position the force of the sand is broken, causing the sand to be deflected and discharged upon the pattern mildly and smoothly, and whereby said baffle may be withdrawn to open position to permit the remainder of the sand to be discharged with the usual force into the mold.

9. The combination with a sand wad throwing device, of a'movable wad disintegrating device located below the discharge outlet of said throwing device and through which the sand is directed.

In testimony whereof I aflix my signature.

VICTOR E. SOHMIEDEKNECHT. 

